> > Also spirits do exist in Naruto and Morggo's technique is used to summon his ancestors or non human spirits.
> 
> You said "spirits of all kinds" in your CS. This would include the ghosts of, say, the Kage. You didn't specify, and it would be a bit ridiculous if you were to use their power in combat. Also, please provide proof as to where exactly spirits are proven as real in the series.

The Bijuu are a kind of spirit. Demons are a type of spirit, and many characters have met the spirits of dead acquaintances like how Kakashi met his father when he was dead. Also the fact that there are techniques that can resurrect the dead prove that there are human spirits.